How many postive intergers less than 4000 with no repeated digits can be formewd where each digit is either 2, 3, 4, 5 or 6?
The answer is 133 but just dont know the working out..
1st digit must be 2 or 3
so that gives you 2*4*3*2 = 48
The answer is 133 but just dont know the working out..
so that gives you 2*4*3*2 = 48